Biography
With a particular focus on the technology, AI, pharmaceutical, energy and defence sectors, she has represented corporations on a wide range of behavioural antitrust matters and investigations, as well as on competition appeals and litigation. A former secondee to the UK telecommunications regulator, she is a trusted adviser on regulation, foreign investment and national security issues.
Jenine is ranked Band 1 for Competition Law by Chambers UK 2027 and is recognised as a leading competition lawyer by Chambers Global and Chambers Europe. She is also included in the Legal 500 Hall of Fame and was named to GCR’s Women in Antitrust 2025. Her recent accolades include being shortlisted for “Lawyer of the Year” in Antitrust & Competition at the Women in Business Law EMEA Awards 2026 and “Innovative Practitioner” at the FT Innovative Lawyers Awards 2025. Her team was also named “Competition Team of the Year” at the Legal Business Awards 2026.
Described by clients in Chambers as “an outstanding practitioner out of any league,” “a sophisticated counselor and responsive to client needs” and “more dedicated than many others.” She is also praised as “tireless and excellent” and “relentless in her pursuit of getting your deal through,” with clients highlighting her as “one of the smartest, if not the smartest lawyer, I've worked with when it comes to strategy and timing” and “a Swiss army knife of strategic vision, tactical execution and just plain smarts.” In Legal 500, clients describe her as a “brilliant legal mind” who provides “calm, credible, and considered advice on complex matters,” is an “excellent communicator” and is “highly commercial and skilled at applying the law to client needs.”
She is a member of the City of London Law Society Competition Law Committee.
Representative experience at Weil and from her previous firm includes:
- Boeing on its $4.7 billion acquisition of Spirit AeroSystems, a key supplier of aerostructures for commercial and military aircraft. The matter won the team “Competition Team of the Year” at the Legal Business Awards 2026
- Microsoft on the OpenAI recapitalisation and restructuring into a Public Benefit Corporation
- Cobham Ultra, a portfolio company of Advent International, on its $3.45 billion sale of Ultra Maritime, a supplier of advanced undersea warfare solutions, to Lockheed Martin
- Microsoft on the CMA investigation into Microsoft’s partnership with OpenAI
- Fox Corporation, a multinational mass media company, on its acquisition of Roku, Inc. for approximately $22 billion
- OCS Group on the national security aspects of its £3.1 billion recommended offer for Mitie Group plc
- Advent International on its sale of IRCA Group, a global manufacturer and supplier of specialized food ingredients, to CVC
- Silver Lake and its portfolio company Cegid in the acquisition of Shine
- A consortium comprising Advent International, Fedex, A&R and PPF on a €7.8 billion recommended all-cash offer for InPost
- Microsoft on the CMA study into AI Foundation Models
- Microsoft on the merger control aspects of its investment in Mistral AI
- Virgin Media O2 on the €17.5 billion joint venture between Vodafone and Three UK, which was cleared by the UK CMA following a complex Phase 2 investigation
- Microsoft on its $68.7 billion acquisition of Activision Blizzard, Inc. This landmark merger control matter won Global Competition Review “Matter of the Year,” “Merger Control Matter of the Year: Americas” and “Merger Control Matter of the Year: Europe” in 2024.
- Advent International and NielsenIQ before the European Commission on NielsenIQ’s combination with GfK, winning a rare conditional Phase 1 approval
- Eutelsat on its $3.4 billion combination with OneWeb creating a leading satellite service provider
- Liberty Global and Telefonica on a joint venture with InfraVia to create nexfibre
- Telefónica on the £31 billion merger of O2 and Virgin Media with Liberty Global plc, including a reference from the European Commission and CMA Phase 2 unconditional clearance
- A number of CMA investigations under the Competition Act 1998 in relation to alleged excessive and unfair pricing and anti-competitive agreements in the pharmaceutical sector
- An intervenor, in the ground breaking CK Telecoms UK Investments v Commission appeal against the European Commission’s Phase 2 decision prohibiting the 3/O2 merger
- The CMA market investigation under the Enterprise Act 2002 into funeral markets
- Inmarsat on its acquisition by Triton Bidco for £2.6 billion, including the public interest intervention investigation under the Enterprise Act 2002
- Tele 2 on the unconditional EU Phase 2 clearance of the merger between Tele2 Netherlands with T-Mobile Netherlands
- A European Commission investigation into cross-border access to pay TV
- EE in obtaining unconditional Phase 2 clearance of the GBP£12.5 billion acquisition by BT Group plc
- EDF on obtaining State aid clearance for Hinkley Point C, including the subsequent appeals
- Imagination Technologies Group PLC on its takeover offer by Canyon Bridge